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prionPRIOn knowledge basePRION:CVE-2022-39257
HistorySep 28, 2022 - 9:15 p.m.

Design/Logic Flaw

2022-09-2821:15:00
PRIOn knowledge base
www.prio-n.com
2
matrix ios sdk
security flaw
key forwarding
decryption
trusted source

7.2 High

AI Score

Confidence

High

0.001 Low

EPSS

Percentile

37.8%

Matrix iOS SDK allows developers to build iOS apps compatible with Matrix. Prior to version 0.23.19, an attacker cooperating with a malicious homeserver can construct messages appearing to have come from another person. Such messages will be marked with a grey shield on some platforms, but this may be missing in others. This attack is possible due to the matrix-ios-sdk implementing a too permissive key forwarding strategy. The default policy for accepting key forwards has been made more strict in the matrix-ios-sdk version 0.23.19. matrix-ios-sdk will now only accept forwarded keys in response to previously issued requests and only from own, verified devices. The SDK now sets a trusted flag on the decrypted message upon decryption, based on whether the key used to decrypt the message was received from a trusted source. Clients need to ensure that messages decrypted with a key with trusted = false are decorated appropriately (for example, by showing a warning for such messages). This attack requires coordination between a malicious home server and an attacker, so those who trust their home servers do not need a workaround.

CPENameOperatorVersion
software_development_kitlt0.23.19

7.2 High

AI Score

Confidence

High

0.001 Low

EPSS

Percentile

37.8%

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